Structural and thermal studies of modified silica-strontium-barium glass from CRT
| Autor: | Zbigniew Olejniczak, M. Kosmal, Paweł Pichniarczyk, Iwona Grelowska, Manuela Reben, Maciej Sitarz |
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| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Transition temperature Organic Chemistry Mineralogy 02 engineering and technology Thermal treatment 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 010406 physical chemistry 0104 chemical sciences Analytical Chemistry law.invention Inorganic Chemistry chemistry.chemical_compound Chemical engineering law Phase (matter) Thermal stability Crystallization Fourier transform infrared spectroscopy 0210 nano-technology Calcium oxide Spectroscopy |
| Zdroj: | Journal of Molecular Structure. 1126:265-274 |
| ISSN: | 0022-2860 |
| Popis: | Glasses were prepared by conventional melting method from 100 g batches. The influence of alumina and calcium oxide on the crystallization process of silica-strontium-barium glass from Cathode Ray Tube (CRT) were studied by means of 27 Al MAS NMR and FTIR spectroscopy. This made possible to determine the influence of additives, e.g. blast furnace slag and cement dust on the structural changes of glasses (changes in the spectra shapes). The introduction of waste modifiers into the glass structure leads to the breaking of Al–O–Si and Si–O–Si bonds what causes the depolymerization of the glass network. From the FTIR spectra the narrowing of the bands at 1022 and 1027 cm −1 was observed, which may indicate on the ordering of glass network. Appearance of alumina in coordination 4 was confirmed by NMR investigations. The effects of compositional variation, thermal treatment on the nature, type and stability field of crystallizing phases and microstructure formed in CaO and/or Al 2 O 3 silica-strontium-barium glasses were described using DTA/DSC method. Thermal characteristics of glasses like the transition temperature T g , the temperature for the crystallization T c , thermal stability parameter were determined. The crystalline phase was determined by the X-ray diffractometry. The microstructure of the samples was studied by SEM technique. Analysis of the local atomic interactions in the structure of glasses has been used to explain the course of the crystallization. |
| Databáze: | OpenAIRE |
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